Signaling system.



B.- R. GILL. SIGNALING SYSTEM. APPLICATION II'LEI) M11113, 190

1,019,781 :Pgtented Mar. 12, 1912.

IC SENDER AU TOMAT l vi'tnemco citizen of the United States,

EDWIN R. GILL, or YONKERS, Nnw HOWARD E. MERRELL, or Nnw PORT, PENNSYLVANIA.

YORK, ,AssIeNoR, 'I B Y 'mnsnn hssieNnnN'rs, r0 roux, N. Y., AND pane J. HAMLIN,'OF smn'rn- I SIGNALING SYSTEM;

Specification. of Letters Patent; iate ntedMar. 12,1912.

application filed March 18, 1909. Serial No. (86,314 .REIS

To all whom it may concern:

Be it known that'I, EDWIN R. GILL, a

city of Yonkers, State of New tain new and useful Improvement in Signaling Systems, of which the following is. a Specification.

This invention relates to signaling systems,-aiid more particularly to such' sysems as are adapted for railroad train despatching. One of the objects thereof is to provide means whereby undesirable interference with an -.instrument such' as a tele phone, due to thea impressing onthe line of a current from a source. thereof, may be reduced to a minimum.

Another object is to provide for imprescounty "of Westchester, and

without interference with the normal operation of the telephonic in truments, or vice versa. 3' A further object is to modify the rise and fall of battery current impressed upon the line to actuate a signaling device, or of an induced current impressed upon the line by the operation of the signaling device, whereby interference with speaking currents bn the line is prevented.

Further objects will be in part obvious, and in part specifically adverted to in the course of the following specification.

In the accompanying drawing, which is to be taken as a part of this specification, and in which I have shown schematically a merely preferred form of embodiment of the invention, the figure re resents a telephone line, having include therein selec- 'tively operated signaling devices, together with types of the adjuncts essential to the successful achievement of the objects premised. 1

Referring now to the drawing, the line is indicated at 1, and 2 represents a battery for impressing current thereon, 3 indicates a local circuit,-including a batter 4, and, inthe present instance, also inc uding a sender key device 5 which, when operated,

.operates a relay 6, thereby effecting the closing of the main line circuit. In order to provide means whereby the battery may be applied to or withdrawn from the line in such manner that no audible'efi'ect is roduced upon the telephone 7, connecte in bridge of the line, I employ devices for residing in the York, have invented a cerond coil, because 0 mg a battery 16, said circuit closed by a circuit closer 17. sion upon the line of'signaling impulses,

slowing down the rate at which the batcurrents rise and fall, such devices comprising inductive resistance or retard coils. One of these impedance's is inserted between the armature 8 of the relay and the line,'and a second between the batter and the line. This se'cf the location, protects the accident, from short circuit. A'condenser 11 is placed between the armature 8 of the relay and one side of the line and a condenser 12 is located in .the bridge of the telephone 7. v The signaling instrument employed in the present system comprises an electric ten 14, included in a 'local circuit 15, havbattery in case of Inther'present embodiment of my inven- ;tion, the operation of circuit closer 17 is {selectively determined by means connected in bridge of the line, through the instrumentality of sender key 5 and relay 6. The selector is shown at 18, and although various types of instrumentsadapted for this purpose may be'used, I preferably employ an-lnstrument of the kind disclosed in Letters Patent No. 906,523, granted to me December 15, 19,08. This selector includes a magnet 19 and a coil 20 on said magnet, the latter being connected at 21 with a battery terminal and with the circuit closer 17, which cooperates with a bell contact 22 to close the ringing circuit 24;. The operative circuit 25 of the mainline includes a coil 26 on magnet 19, and inthe present instance coils2O and 26 are distinguished from each other by the use of heavy and light lines to designate them respectively. Retard coils 27 and 28 are'arranged in series between the terminal of the selector and the line.

Having thus described my improved sig naling system, the operation thereof may now be understood. When the relay 6 is operated, the battery 4 begins to charge the condensers, the potential between the armature of the relay and the line rising slowly, while the impedance in the line circuit tends to still further reduce the rate of-current increase. Accordingly since the current rises. and falls very slowly," the portion thereof which passes through the tele-v phone apparatus, does not interfere with the normal operation of the latter, The battery circuit, therefore, may be worked siadapted to be multaneously upon the line so as to operate a a device, such as the selector shown herein,

the bell. armature,

-without the telephone or said selector inter- 20, which acts as a the magnet; to set the main line,

theitelephoneapparatus connected in bridge of'the line," might interfere with the voice currents transmitted to or from such apparatus; but such interference is minimized by the insertion of the impedance in the bridgeof the selector circuit. This impedance also insur s that theoperation of the selector mecham ln shall not be in anywise affected by the voice currents.

., It will be apparent that by the use of the system described audible annoyances and undesirable interference ordinarily caused by battery or current changes are overcome,

permitting the simultaneous operation of telephonic apparatus and the signal devices i above system,

, taken over a single line, in an entirely etiicient manner. It will also be apparent that the provision of the impedance serves to protect the various instruments from lightning.

As many changes could. be made in the and many apparently widely different embodiments of this invention could vbe made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be as illustrative, and not in a limiting sense.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, isz

1. A system-adapted for the simultaneous operation of message receiving instruments and selective-signaling devices, comprising Egrallel lines,

impedance in series with said es,.a protective short circuit across said lines comprising suitably proportioned capacity andlnductanceln series, message re ce1v1n instruments in bridge of said lines,

I a con enser in said bridge, selective signal ing devices in bridge of said lines, and impedance in said last bridge.

2. A system adapted for the simultaneous operation of message receiving instruments and selectivesignaling devices, comprising parallel lines, impedance in series with said lines, condensa'nce in bridge of said lines, message receiving instruments in bridge of said lines, condensance in said bridge,'s'elective signaling devices in bridge of said lines, and impedance in said last bridge disposed between.saidselective device and each of said lines.

' 3. A system adapted for the simultaneous by the operalines,

-met'allic sides, lines impedance in said bridge, a-local 'cir-' lines, a condenser in said bridge, an inducbe' controlled by said selector.

4. A system adapted for the simultaneous operation of message receiving instruments and selective signaling'devices, comprising parallellines, impedance in series with said condensance in bridge'thereof, a message receiving instrument in bridge of said lines, condensan'ce in said-bridge, an incluc tive selector in bridge of said lines, impedance in said bridge and arran ed between said selector and each of said ines, and a local circuit including an alarm device controlled by said selector.

5. In a system adapted for the simultaneous operation of telephones and selective signaling device, in combination, a circuit comprising. parallel lines, means for impressing current on said lines, for controlling the impresslon of current upon said lines, a telephone in bridge of said lines, inductive selector in bridge of said lines, impedance in said bridge, a localsignal comprising an alarm device, and a circuit for the local signal controlled by said selector.

6. In a signaling system of the class described, in combination, a line comprising a selector in bridge, of said cuit comprising a local signaladapted to be closed by' selector, telephone apparatus in bridge of said line, a condenser in said bridge, a battery, battery to the line, and impedance-located between the battery and the line.

7. In a system adapted for the simultaneous operation of telephones and selective signaling device, in combination, a circuit comprising parallel lines, means for impressing current on said lines, a key oper-" ated relay, for controlling the impression of current upon said .lines, a plurality of impedance' devices in series condenser in bridge thereof, a telephone in bridge with said lines, a condenser in said bridge, an inductive selector in bridge of said lines, impedance in said bridge, a local impedance in series with, said tive selector in bridge of said lines, and a local circuit including a signal adapted to a key operated relay a relay'for applying said with said lines, a

condens'ance in said-bridge, an

signal comprislng an alarm device, and a I circuit for the local signal controlled by said selector.

8. In a system adapted for the simultane ous operation of telephone and selective signaling devices in combination, a circuit pedancle devices in series with said lines, a condenser in bridge thereofla telephone in bridge of said lines, a condenser in said bridge, an inductive selector in bridge of said lines, a plurality of impedance devices in said last bridge one of said devices being located between each of terminalsof the selective device and one of said lines a local circuit, and an alarm in said local circuit,

the operation of which is; determined by the 10 opening and closing of said local circuit by said selector. i

' In testimony whereof I aflix my signature Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

